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hram777 [196]
3 years ago
9

Explain how valves help the transport of blood in veins.

Biology
1 answer:
pychu [463]3 years ago
4 0

Answer:

The valves' main job is to keep the blood moving in one direction – back up towards the heart. When the valve is open, blood freely flows upward towards the heart and when the valves are closed, blood cannot flow back

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How did the results of Meselson and Stahl's experiment confirm that
Vinil7 [7]

Answer: Meselson & Stahl reasoned that these experiments showed that DNA replication was semi-conservative: the DNA strands separate and each makes a copy of itself, so that each daughter molecule comprises one "old" and one "new" strand. The semi-conservative model, in which each strand of DNA serves as a template to make a new, complementary strand, seemed most likely based on DNA's structure. ... From the patterns of DNA labeling they saw, Meselson and Stahl confirmed that DNA is replicated semi-conservatively.

Explanation:

3 0
3 years ago
After mitosis, how many chromosomes do the new cells have compared to the original?
irakobra [83]

Answer:

The same

Explanation:

In mitosis, genetically identical daughter cells are created. In meiosis the number of chromosomes is half as many as the original cell

6 0
3 years ago
Read 2 more answers
Male Japanese quail became sexually aroused by a red light that was repeatedly associated with the presentation of a female quai
vodka [1.7K]

Answer:

Conditioned response.

Explanation:

Conditioned response may be defined as a type of learned behavior used in the Pavlov experiment. This type of response mainly generated when the neutral stimulus get mixed with the strong stimulus.

The male quail can be sexually arouse by red light. The red light here acts as the conditioned response because the neutral stimulus (red light) when mixed with the unconditioned stimulus result in the presentation of the female quail and increases the response of the male quail.

Thus, the correct answer is conditioned response.  

3 0
3 years ago
The oxygen-binding protein found in muscle cells is ________.
pantera1 [17]
B) Hemogoblin
I’m pretty sure
Hope that helps :)
5 0
1 year ago
Read 2 more answers
Red-green color blindness is an X-linked recessive disorder that is passed through generations and can be traced by using a pedi
Nostrana [21]

Answer:

Lisa and Monica

Explanation:

<em>The correct answer would be Lisa and Monica.</em>

<u>For X-linked recessive disorders, a female can be unaffected, a carrier, or affected. However, a male can either be affected or unaffected and never a carrier. This is because females have two X chromosomes while males have only one.</u>

In addition, completely filled-in shapes in a pedigree mean that such individuals are affected for the trait in question while half-filled shapes mean the individuals are carriers for the trait.

Hence, individuals in the pedigree that are labeled carriers for red-green color blindness are Lisa and Monica (they both have half-filled shapes).

8 0
3 years ago
Read 2 more answers
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