Which portion of the sperm contains the enzymes needed to penetrate the oocyte?

1 answer:

5 0

The head of the sperm contains the necessary enzymes to help it penetrate the oocyte. The sperm cell is anatomically structured to have four parts which are the head, neck, midpiece, and a tail. Inside the head of the sperm are densely coiled chromatin fibers that contain the nucleus for helping the sperm penetrate the female fertilized egg necessary for reproduction.

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The plasma membrane represents an energetic barrier to the free diffusion of ions from the extracellular space into the cytoplas

Marysya12 [62]

Answer:

Why are molecules such as valinomycin effective at transporting ions across the membrane?

Valinomycin is effective as transporting ions across the membrane because it is no charged, so it can carry ions.

Why would a drop in temperature to or below the transition temperature limit valinomycin mediated K+ transport across the plasma membrane?

Valinomycin is limited by temperature because its activity is highly sensitive and it depends on a stable and an average temperature.

Explanation:

Valinomycin is effective at transporting ion across the membrane because is an antibiotic that alternates hydroxy and amino acid, ans it helps membranes to be permeable. Valinomycin is a cyclic molecule that helps in ions transportation through membranes. Also, antibiotics have a temperature range of activity, that's why it is sensitive to changes.

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2 years ago

Male bowebirds spend much of their time decorating their nests. What is the most likely reason the males would do this?

Pavlova-9 [17]

The answer would be it is easier for them to find their nest when they decorate

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2 years ago

Where do queen bees lay eggs and larval bees are fed by worker bees

steposvetlana [31]

Answer:

1. Queen bees lay their eggs after within each cell inside a honeycomb.

2. True. Worker bees feed the larvae with a combination of nutrients, from nectar and pollen to bee milk and water.

Explanation:

1. Queen bees lay their eggs after within each cell inside a honeycomb (hive) [See image below] during the winter.

The queen is able to lay over two thousand eggs PER DAY! Each egg has an approximate size of 1 mm long. This process then leads to the formation of a whole new colony of bees.

2. True.

Worker bees have the largest density of all, that is, there are numerous worker bees within a colony. As their name "worker" implies, they have plenty of tasks to perform. For example, they have to clean the hive regularly, ventilate it during warm conditions or keep it warm during cold conditions, and also care for the queen. However, one the most important roles of workers is to feed the larvae, during this stage they are also called "nurse bees." These bees feed the young with a combination of nutrients, from nectar and pollen to bee milk and water.

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3 years ago

All of the statements regarding the history of life on Earth are true except: Group of answer choices a) The history of planet E

liq [111]

Answer:

the correct answer is A

Explanation:

Option A is the one that is considered false since the warm stages that the earth goes through are called greenhouse stages, but the cold ones are not called in the same way but are called glaciation stages.

3 0

2 years ago

Plz help me.

ludmilkaskok [199]

idk man. But you can look up from quizlet. It helps a lot

7 0

3 years ago