BIOLOGY HIGH SCHOOL

Under the leadership of Mikhail Gorbachev, the doctrine of perestroika called for which of the following? A. Openness in communication
B. Democratic elections
C. A central banking system under private ownership
D. More local control and free-market practices

Answers

Answer 1
Answer: Under the leadership of Mikhail Gorbachev, the doctrine of perestroika called for "A. Openness in communication", since the "closed off" Soviet Tactics of the past were clearly not working by the 1980s.

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How many carbon dioxide molecules are used in photosynthesis?

Answers

Answer:

6 carbon dioxide molecules were used in photosynthesis.

Which of the following organisms are considered to be plant-like protists?A. bacteria
B. algae
C. plasmodia
D. paramecia

Answers

b. algae.
Algae produces energy through photosynthesis just like plants, but it isn't a plant.

The Northern Hemisphere is warmer in spring than in winter, because in springA) the days are shorter.
B) it gets more direct sunlight.
C) the Earth is closer to the Sun.
D) it is tilted away from the Sun.

Answers

Answer:

Option (B)

Explanation:

When the tilt of the earth is towards the sun, then it is called summer in the northern hemisphere. In this position, the sunlight is directly over the earth, as a result of which it absorbs more amount of heat. Spring is the season that starts from about 21st March to 21st of June or it can be considered as the season that exists between the summer and winter. Here, a high amount of sunlight is absorbed due to which the temperature eventually rises.

This is the reason why the northern hemisphere is relatively warmer during the spring season than in winter.

Hence, the correct answer is option (B).
B. It gets more direct sunlight. 

Which phase of the cell directly follows metaphase

Answers

the phase that follows after metaphase is anaphase

Proteins have a variety of functions within a living cell. Describe at least three of the possible functions of proteins, and explain how proteins can be so diverse when there are only a limited number of different amino acids.

Answers

anonymous  3 years agoProteins are involved in almost all of the cell's functions. They can act as: Transportation: they can transport hydrophobic molecules in blood for example Regulation: protein hormones and enzymes Receptor: can act as receptors on cell surface and in the subsequent signal transduction (G-protein for instance) It is true that all proteins are made up of up to 20 amino acids, but there are several reasons for their diverse actions: -One reason is the possible sequence and number of amino acids: Met-Ser-His is different from Met-His-Ser for example. Besides, you have different chain length, for a protein is made up of long chain of polypeptide (longer than 50-70 amino acids) and can have any of the 20 amino acids with repetition, so using simple probability, this can provide up to practically unlimited combination with proteins that have chains of thousands of amino acids. -Another very crucial reason for the diversity of protein action is the conformation. A protein passes by at least 3 conformational stages before becoming mature. The straight amino acid chain is the primary structure of the protein that can never be active. Spatial modification of this primary structure results in a secondary structure, Helix or Beta-pleated sheets (or other coiling structure), that is also inactive. Further coiling and bending of the secondary structure produce a 3-dimentional conformation that is the active form of the protein. Moreover, many proteins can undergo further conformational rearrangement and combination with other protein sub-units producing a quaternary structure.

Doe protein make up 90% of our body weight?

Answers

No. Protein is an important component of every cell in the body. Hair and nails are mostly made of protein, the body uses protein to build and repair tissues as well as to make enzymes, hormones, and other body chemicals. Protein is an important building block of bones, muscles, cartilage, skin, and blood.
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