BIOLOGY HIGH SCHOOL

3. For your organ system, describe how the system works at the organ level.

Answers

Answer 1
Answer:

Answer: Lets take the circulatory system; a simple explanation would be that first the “arties” carry the blood from the “heart” through “blood vessels” to the “capillaries” who then release oxygen and nutrients and take carbon dioxide and the waste products of cellular respiration. When that is complete the “veins” take the blood and carry it back to the “heart”.

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Help with this please?
There are two alleles, B and b, at a gene locus in a population at Hardy-Weinberg equilibrium. The relative frequency of the dominant (B) allele is 0.7. What is the expected number of heterozygous individuals if the total population size is 500 individuals?

What are small organelles that make proteins

Answers

I believe the answer is ribosomes

In What stage of the cell cycle does dna replication occur?

Answers

Answer:

The correct answer is- Synthesis(S) phase

Explanation:

Interphase is the phase where cells spend most of their time. It is known as the resting phase and contains 3 stages called G1, S, and G2 phase. In G1 phase cells grow in size and produce those enzymes which are required for DNA replication.

In the synthesis phase, the DNA is replicated and gets doubled. This event is very important in the cell cycle because it allows each cell produced after cell division to take an equal amount of genetic material which is identical. Therefore in the cell cycle DNA replication occurs in the synthesis phase.
The interphase of cell cycle has 3 stages: G1, S, and G2 phase. The replication of the DNA occurs during the S phase. In the G1 phase cell grows and prepares for DNA replication, while in G2 phase cell prepares itself for cell division.

Even if you live in the middle of North America, the quality of your watershed can affect the quality of the ocean. How can this be? Select one: a. Evaporation carries materials from your watershed to the ocean. Incorrect b. Materials in your watershed are eventually transported to an ocean. c. The amount of water in your watershed will affect ocean evaporation. d. Materials in your watershed are not transported to an ocean.

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The appropriate answer is b. Materials in your watershed are eventually trasported to an ocean. A watershed is the land area in which surface runoff enters into a river or river system. All rivers flow from a high elevation (upper course) to a low elevation (lower course). In most cases the lowest point where a river will flow to is the sea. As rivers flow they transport and deposit material along the course and eventually in the sea.

The circulatory system of mammals has a ________ chambered heart.a. two
b. three
c. four
d. one

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The circulatory system of mammals has a ________ chambered heart. c. four
of two chambered heart, but humans have four

In August 2005, Hurricane Katrina caused significant damage in several states along the Gulf Coast, including Alabama, Mississippi, and Louisiana. Thousands of people were evacuated from their homes due to flooding and other damage that was caused by the storm. Which type of limiting factor was Hurricane Katrina?A) density-independent factor
B) density-dependent factor
C) population-dependent factor
D) population-independent factor

Answers

The correct option is A.

A density independent factor refer to a weather or climate condition, which exert its influence on a population size without regard for the size of the population and its density. Limiting factor refers to any factor that put a limitation on the growth, abundance or distribution of a population. In the question given above, the Hurricane Katrina is a density independent factor because the hazardous event affected all the people that are resident in the affected areas.
Hurricane Katrina was an example of a density independent factor because this disaster affected everyone in the area. It did not selectively have an effect like a density dependent factor would.

A client's blood pressure drops from 120/76 to 90/60 mm Hg as soon as positive end-expiratory pressure (PEEP) is initiated for the treatment of hypoxemia. What is the most likely cause of this decrease in blood pressure?

Answers

Answer:

Decrease in cardiac output

Explanation:

Blood pressure may be defined as the pressure exerts by the artery on the walls during the blood flow. The systolic pressure is used for the calculation of the blood pressure.

The blood pressure depends upon the cardiac output, heart beats and rate of the blood flow. The cardiac output is the volume of blood pumped in the body per minute. The decrease in the cardiac output will ultimately results in the decrease in the blood pressure.

Thus, the correct answer is decrease in cardiac output.
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