Which component is present in some viruses but absent in others?

Answers

Answer 1

Answer:

The correct answer would be the virus envelope.

Viral envelope is a protective covering present around the capsid proteins in some viruses.

It is usually derived from the cell membrane of the host and thus it is composed of lipid and viral proteins.

It provides stability to the viral particle, helps in protecting the viral genome, and aids in the fusion of the virus with the membrane of the host.

Examples of viruses in which envelope is present: herpesviruses, poxviruses, flavivirus, hepatitis D et cetera.

Examples of viruses in which envelope is absent: adenoviridae , papillomaviridae , picornaviridae , caliciviridae et cetera.

Answer 2

Answer: Hey there

A component that is present in some viruses but absent in others is called envelope. Some viruses have a lipid membrane and other don't.

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The human body uses specialized biomolecules to speed up chemical reactions. These are called enzymes. Without enzymes, the reaction in the body would happen too slowly to keep you alive. Which biomolecule do enzymes belong to?
A. Proteins
B. Lipids
C. Nucleic acids
D. Carbohydrates

Answers

Final answer:

Enzymes are biomolecules that belong to proteins. They are vital for speeding up chemical reactions in the human body to ensure healthy living.

Explanation:

Enzymes are specialized biomolecules that play a fundamental role in the human body, primarily by speeding up chemical reactions critical for life. These biomolecules belong to the category of Proteins. This is because enzymes are composed of sequences of amino acids, which are the building blocks of proteins.

Unlike lipids, nucleic acids, and carbohydrates, proteins possess the unique ability to function as biological catalysts, reducing the amount of energy required for a reaction and thereby accelerating its rate.

Learn more about Enzymes here:

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Answer:

Explanation:

Enzymes are proteins.

The _____ nerve connects to the heart and adjusts its speed according to the body's demands.

Answers

The vagus nerve connects to the heart

If the sperm gamete that fertilizes an egg has a(n) _____ chromosome, it will form female offspring.

Answers

The answer is XX.
X is a female, XX is a female, Y is a male, XY is a female

XX because male is XY, and female is XX

Which two factors have combined to create the Hawaiian island chain?A. seafloor spreading and uplift
B. plate motion and hot spot volcanism
C. abyssal tectonics and plate separation
D. hydrothermal venting and changes in sea level

Answers

The answer would be b

B. plate motion and hot spot volcanism

What causes continental lithosphere to become thinner and weaken?

Answers

Continental litosphere is made of relatively light weight minerals. It has a low density. Oceanic litosphetre is composed of a heavier minerals. Tensions and heat flow in the asthenosphere( beneath the litosphere) waekens the floating solid plate causing it to break apart. Thinning of the continental litosphere is result of hydration weakening. It is a special consequence of plate tectonics. By hydration weakening the basal portions of litosphere can be transformed into convecting asthenosphere.

What did Charles Darwin mean when he stated that some organisms were 'more fit' than other organisms?A) some organisms were heavier and stronger
B) some organisms were more likely to reproduce
C) not all organisms had the same natural life span
D) not all organisms were equally suited to gathering food

Answers

When Charles Darwin stated that some organisms were 'more fit' than other organisms, he meant that some organisms were more likely to reproduce. He meant that some organisms are more likely to pass on more desirable and useful traits to offspring than other organisms. The correct answer is letter "B."

Answer:

Explanation:

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Plant cells have _____ and _____, which are not present in animal cells.a. mitochondria, chloroplasts b. cell membranes, cell walls c. chloroplasts, nucleus d. chloroplasts, cell walls

Which of the following statements regarding taste and smell is true? A. Taste buds wear out and are replaced about every 25 days. B. Women tend to have a better sense of smell than men. C. So-called supertasters may be inclined to obesity. D. People often have a very short memory of smells.