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Paladinen [302]
3 years ago
10

40 POINTS PLEZ HELP :)

Biology
1 answer:
Angelina_Jolie [31]3 years ago
4 0

2. To focus a microscope using the high power lens you must first in low power center the specimen and make sure it is in focus. Then switch to high power and adjust using the fine adjustment or the smaller knob.

3. It prevents dust from settling on the scope and in the lenses.

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increasing intracellular cAMP leads to smooth muscle relaxation by: Group of answer choices inhibiting IP3 channels, leading to
kirza4 [7]

Answer:

1. Inhibiting IP3 channels, leading to decreased Ca2 in the sarcoplasm and reduced contraction.  

2. Increasing the relative activity of MLCP, leading to a decrease in tension.

3. Activating K channels, increasing K leaking out of the cell which hyperpolarizes it and decreases the likelihood of Ca2 entry.

Explanation

In smooth muscle, cyclic AMP (cAMP) mediates relaxation because cAMP inhibits a specific kinase required for myosin light chain protein (MLCP) phosphorylation, thereby triggering contraction in the smooth muscles. It has been shown that cAMP inhibits 1,4,5-trisphosphate (IP3)-dependent calcium ions (Ca 2+) release by activation of the cGMP-dependent protein kinase (PKG). PKG proteins act to modulate Ca2+ oscillations by stimulating sarcoplasmic Ca2+-ATPase membrane proteins, increasing Ca2+ in the sarcoplasmic reticulum stores and Ca2+ efflux from the cells, and activate voltage-gated potassium (K) channels, thereby leading to membrane hyperpolarization and reducing Ca2+ entry through Ca2+ channels.

6 0
2 years ago
how does codominance at the molecular level help to explain why evolutionary processes haven't resulted in the elimination fo th
Yanka [14]

Answer:

here.

Explanation:

Due to the prevalence of malaria in Africa, the allele for sickle cell anemia (HbS) provides a selective advantage. That's why it remains in the population.

A normal African person (HbAHbA), with normal haemoglobin, will not die of anemia, but will die of malaria.

An African person with sickle cell anemia (HbSHbS), with abnormal haemoglobin, will die of anemia.

A heterozygous African person (HbAHbS), with half of his red blood cells (RBCs) being normal and the other half being sickle-shaped, will neither die from anemia, nor malaria since the plasmodium will be incapable of completing its life cycle in the abnormal RBCs.

Thus heterozygous African people will grow, reproduce and pass on the HbS allele to the next generations.

8 0
3 years ago
During which stage of a cell’s cycle do the replicated chromosomes become visable?
Orlov [11]

Answer:Prophase

Explanation: Prophase is when chromosomes are made and the nuclear membrane breaks it down and later into the appearance of spindle fibers.

6 0
3 years ago
Temperate environments have some of the best soils in the world, even compared to tropical soils. The reason is
Inessa [10]

Temperate environment have the best soil in the world because of higher nutrient levels.

<h3>What is soil?</h3>

Soil is the topmost layer of the earth on which plants grow.

Types of soil include:

  • loamy soil
  • sandy soil
  • clayey soil

The best soil for plant growth is loamy soil because it contains the most nutrients.

Temperate environment have the best soil in the world because of higher nutrient levels.

Learn more about soils at: brainly.com/question/25831026

5 0
2 years ago
Identify five people whom you consider to be mature
masya89 [10]
In general for everyone, these are the most likely group of people i've chosen mature; grandparents(grandma,granddad), parents (mom,dad), your teacher.
3 0
3 years ago
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