In guinea pigs, a single gene with two alleles (B and b) determines coat color. Black (B) is dominant over white (b). A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black. Two of the F1 progeny are mated with each other. What proportion of the black F2 progeny is expected to be heterozygous?

Answer:

I believe the answer is A.

Explanation:

Species may share similar physical features because that feature was present in a common ancestor. These features are known as homologous structures.

Answers b, c, and d sound probable, but those responses of foods, habitat, and genetic mutation don't directly correlate with the theory of evolution.

For example: In option d, these organisms all most likely suffered from a genetic mutation, but the similarity of the embryos does not prove that.

The correct answer is A. It shows that these organisms share a common ancestor.

Explanation:

In biology, the Theory of Evolution was first proposed by Darwin and Wallace and this explains organisms evolve or change over time which means their genes and physical traits are not static but the result of changes in previous generations mainly influenced by environmental changes that make certain traits prevail over others. In the same way, in this theory, changes in species lead to new species and this implies all living organism and even those that are already extinct have one common ancestor and this was the origin of all species as changes in genes and traits or evolution took place.

This idea is supported with different types evidence and one of this is that different types of animals such as birds, reptiles, and mammals look almost identical in the embryonic stage which shows they share common features but as the embryon develops certain features are shown over others. Therefore, comparing the physical appearance of embryos support the theory of evolution as it shows that these organisms share a common ancestor.

The manubrium articulates with the clavicles on its superior border.

Answer: Saprophytic mode of nutrition

Explanation:

Fungi are the group of organism that feed on the dead and decaying organism by feeding on them.

Fungi release digestive enzymes and performs extracellular digestion on it.They breakdown the complex organic food material into simple nutrients that can be absorbed by fungi.

This is how the fungi obtain energy to survive.

Answer: Option A

Explanation:

The chief cells in the alimentary canal of the organism releases an enzyme which is helpful in the digestion of the protein.

The name of the enzyme id pepsin which is not required much in the body of the organism who feeds on the plants and plant extracts.

This is because the plants have higher amount of carbohydrates in it and less source of protein.

Hence, for the digestion of cellulose, pepsin is not required.

Answer:

Is the merging of DNA from unrelated organisms to create new genetic varieties

Explanation:

Recombinant DNA creates transgenic organisms. Foreign DNA from another species can be incorporated in the genome of another species through several ways such as electroporation and transduction. The transgenic organism will, therefore, exhibit traits coded for by the foreign genetic material. This form of biotechnology/genetic engineering is used to modify characteristics of an organism so it exhibits desired traits.

Answer: A. antigen

Explanation:

An antigen is a protein that is present over the surface of the red blood cells. The type of antigen present over the surface of the red blood cell determine the blood type ( A, B, AB, O). The Rh factor is an antigen which is an inherited protein that can be found over the surface of the red blood cells. If an individual posses Rh antigen in the blood that will exhibit the Rh positive blood type. The one which does not posses the Rh antigen in the blood will be consider as Rh negative blood type.  

Answer:

The neurulation process involves two steps: Primary neural induction and Secondary neural induction.

Explanation:

Neurulation may be defined as the process of formation of neural tube from the neural plate. Neurulation starts when the notochord induces the formation of central nervous system.

Two main stages of neurulation are:

Primary neural induction: Primary neurulation is the process of transformation of flat neural plate into circular neural plate. Gene products gradient determines the induction of neural plate.

Secondary neurulation: The medullary cord is formed by the neural ectoderm and endoderm. Cavites formed from the medullary cord changes into the single neural tube.

Answer:

A

Explanation:

In its best form, a free market economy will determine a price by supply and demand.

Local governments can't determine anything unless it is a local commodity or product which will not be used anywhere else. Even then, the government is interfering with supply and demand.

National government -- same answer as local government. Any government interference does not result in a free market economy.

There are not enough wealthy citizens around to influence many markets.

Your best answer is A

Answer:

The correct option is ALL OF THE ABOVE.

Explanation:

Microbes that live in deep sea thermal vents have characteristics that are quite different from those of microbes that are found in other places. Microbes that live in deep sea thermal vent do not need sunlight and oxygen to survive. Thermal vent microbes lives in salty environments, whose pressure is different from the pressure that is found on the earth surface. Also, the temperature, at which these micro organisms can survive is very high compare to those of microbes that are found at other locations.

Based on these characteristics, a microbe that is found growing near a deep sea thermal vent can not survive at normal room temperature. For the micro organism to grow, the researchers has to duplicate the  extreme environmental conditions that are found in the thermal vent, which is the original habitat of the microorganism.

The microbe from the deep sea thermal vent has specialized requirements and may not grow in standard lab conditions due to differences in pressure, salt concentration, oxygen levels, or temperature, which all align with answer C, "All of the above."

Researchers may be unsuccessful at growing the recently discovered microbe from the deep sea thermal vent near the Galapagos Islands due to a variety of specialized conditions that these microorganisms require. Answer C, "All of the above," is correct because there are several factors affecting the growth of these microbes in a lab setting at surface pressure and temperature. These microbes could be barophilic organisms that cannot survive without the high pressure present at the bottom of the ocean, or they may be unable to tolerate the osmotic pressure differences caused by dissimilar salt concentrations in the lab media. Additionally, being strict anaerobes, they could be poisoned by the oxygen in the lab or they might be psychrophiles whose enzymes operate outside their normal range at room temperature. These are all potential reasons why these extremophile bacteria fail to grow under typical lab conditions.

Answer:

Explanation:

It is the A the Diaphragm

Answer:

pyruvic acid converts into lactic acid when there is a lack of oxygen

Answer:

It's agaropectin which is a charged polymer

Answer:

I believe this is the Biceps femoris

Explanation:

Hope this helped.

Answer: Im not completely sure but I believe that is true as they do soemthing similiar in other types of surgeries.

Answer:

"Macrophages" cells are commonly dispersed (mixed in) with simple columnar epithelial cells. They are responsible for secreting mucus.

Explanation:

Answer:

The correct option is A.

Explanation:

Here is the complete sentence: Hox genes APPEAR TO FUNCTION IN SIMILAR WAYS ACROSS DIVERSE GROUP OF ORGANISMS.

Hox genes refer to a group of transcription factor genes that control and regulate animals development. Hox genes function by specifying segment identity, that is, they are responsible for determining the parts of the embryo in which different structures will form. For instance, the genes determines the part of the embryo that will develop into head, legs, stomach, etc.

Hox genes are usually clustered together in a particular spot on the chromosomes and they are present in different forms of animals; the function of hox genes in these animals are similar.

Answer:

Explanation:

False. Renal refers to the kidneys not the liver. But the statement is 1/2 correct. An artery carries blood from the heart to an organ. So that much is correct.

Answer:

The affirmation that sufficient intakes of calcium-rich foods may increase the risk of colon cancer, is false.

Explanation:

According to several studies carried out both in the U.S and other countries, although with not a significant evidence, it was seen that on the contrary, people whose diets had a consumption of calcium in their diet, above 700 mg, more or less depending on the study being researched, the possibility of suffering of colon cancer, particularly of the distal parts, was much less than in those with a low dietary consumption of this mineral. Most of the studies that have been published, like the Nurses´ Health Study, among others, show that a good level of consumption of calcium, within the appropriate limits set for daily dietary intake, may lower the risk of suffering colon cancer in people.

Answer:

(A). more urine is produced.

Explanation:

ADH (antidiuretic hormone), also known as vasopressin is a peptide hormone, which is synthezied in hypothalamus and is secreted by posterior pituitary gland.  

ADH plays role in osmoregulation as it is responsible for water retention by decreasing urine output when there is low level of water in body.

As ADH is responsible for decreased urine formation, more urine will be produced due to decrease in ADH that would lead to an increase osmolarity of urine.  

Thus, the correct answer is option (A).

ADH regulates the body's water balance. When ADH levels decrease, more urine is produced and the osmolarity of the urine decreases. Thus, the correct answer is both A and C.

Antidiuretic hormone (ADH), also known as vasopressin, is a hormone that plays a significant role in controlling the body's water balance. When the level of ADH decreases, the kidneys are less stimulated to reabsorb water, resulting in more urine being produced (option A) and the osmolarity of the urine decreases (option C). Thus the correct answer would be option D: both A and C. ADH's prime function is to conserve the fluid volume of your body by reducing the amount of water passed out in the urine.

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The seminal gland (seminal vesicle) is responsible for producing a secretion that includes fructose, prostaglandin, and fibrinogen, which are essential for sperm viability and fertilization, option A is correct.

The organ that produces a secretion containing fructose, prostaglandin, and fibrinogen is the seminal gland (seminal vesicle). These components are crucial for the viability and motility of sperm. Fructose provides energy for sperm, prostaglandins help in sperm acclimatization to the female reproductive tract, and fibrinogen contributes to the semen's clotting in the female reproductive tract after ejaculation, which is important for successful fertilization.

Answer:

Acetyl CoA

Explanation:

Fat, sugars and proteins are digested into their monomers namely fatty acid and glycerol, simple sugar and amino acids respectively. These simple chemicals are finally digested into acetyl CoA.

Acetyl CoA enters the TCA cycle and is completely broken down into CO2 and H2O.  The energy released during redox reactions of the TCA cycle is stored in the form of NADH and FADH2 which then enter the oxidative phosphorylation.

Answer:

Adipose tissue

Explanation:

Adipose tissue is an example of loose connective tissue. The cells of the adipose tissues are filled with droplets of fat. When there is a need for energy and glucose is not available as an energy source, the stored fats enter the catabolic pathway to produce energy in the form of ATP. The proportion of stored fat in adipose tissues is as high as 80%.  

Hence, adipose tissues are the connective tissues that serve to store energy in the form of fat droplets.  

Answer:

Type l cells.

Explanation:

because according to my knowledge of science, the correct answer to this question is Type l cells.

* Hopefully this helps:) Mark me the brainliest:)

Answer:

Option (b) When dehydrated, a camel stores nitrogenous wastes in its tissues to conserve water.

Explanation:

The camel has good a hump on its back that helps with water storage. This is also made up of a water soluble fatty substance and fats. The water regulation is also controlled by the nephron which is an integral part of the kidney. The nephron has the Loop of Henle that regulates the retention of the water in the body. When there is no water, the potential of the ions force the water back into the kidneys so that the cells do not get disturbed. The nitrogenous wastes are expelled out as soon as possible because they form ammonium salts that may disturb the cell metabolism.

Hence, option (b) is not true.

Final answer:

The incorrect statement is that camels store nitrogenous wastes in tissues. In truth, camels and other mammals concentrate urine. Large mammals can be more active in the heat due to their favorable surface area-to-volume ratio and efficient temperature regulation that affects water balance.

Explanation:

The incorrect statement in the question regarding water and ion balance is 'When dehydrated, a camel stores nitrogenous wastes in its tissues to conserve water.' The correct process that camels and other mammals use when dehydrated is not to store nitrogenous wastes in tissues but to concentrate urines, like urea, to conserve water. Camel kidneys are extremely efficient at reabsorbing water to minimize water loss.

Large mammals, compared to small ones, have a smaller surface area-to-volume ratio, which indeed minimizes heat exchange with the environment and allows them to be more active during the heat of the day. This can be understood in the context of their heat conservation mechanisms, such as having layers of fat and sometimes fur or feathers for insulation.

Temperature regulation is intrinsically linked to water and ion balance, particularly in terrestrial endotherms which must maintain homeostasis in internal temperature. Thermoregulation can lead to water loss through mechanisms like sweating or panting. Conversely, small desert mammals like the kangaroo rat have adaptations, such as very efficient kidneys, to minimize water loss. Varying thermoregulation may allow them to cope with extreme temperatures while conserving water, but suspending thermoregulation entirely would be detrimental to their survival.

Answer:

b. tropomyocin

Explanation:

The thin filament is made up of three proteins mainly. These are actin, troponin, and tropomyosin.  

Among these three proteins of the thin filament, actin and troponin are globular proteins. The globular proteins have a spherical shape and are shorter in length.  

On the other hand, tropomyosin is a rod-shaped protein. Each molecule of tropomyosin has around 284 amino acids. The protein is helix in nature and has a filamentous structure. Hence, among the three proteins of the thin filament, tropomyosin is the longest one. One molecule of tropomyosin can cover the seven molecules of actin proteins.  

Answer:

Haversian system or Osteon

Explanation:

The cylindrical shaped units present in compact bones are called Haversian systems. Also called as osteon, each Haversian system has a matrix in the form of thin layers. These thin layers of the matrix are called lamellae and are arranged in concentric layers called central canals. The space between the lamellae of each osteon is occupied by osteocytes.

Answer:

B. secrete granzymes and perforin.

Explanation:

Perforins are the proteins that perforate the plasma membrane of the target cell and lead to bursting of cells due to holes formed in its membrane. Granzymes are the proteolytic enzymes. They serve to stimulate the target cells to kill themselves by the process of apoptosis.

Binding of natural killer cells to their target cells stimulate the release of granules that are filled with perforins or granzymes to kill the target cells.

Likewise, cytotoxic T cells bind to the infected body cells and release the granules filled with perforins or granzymes to kill those infected cells.