How does xylem differ from phloem?

A. Xylem has living cells.

B. Xylem is found in the roots.

C. Xylem contains chloroplasts.

D. Xylem has a two-way flow.

If a factory represents a cell, which organelle is most similar to the packaging and shipping department of the factory?

What is the function of a chloroplast in a cell? A. It controls the water content. B. It provides support and protection. C. It converts light energy into chemical energy. D. It breaks down waste materials

Viruses rely on a host cell to carry out metabolic functions. what molecule does a virus insert into a host cell that enables the virus to re-direct the host cell/'s enzymes and ribosomes?

If a population of nitrogen fixing bacteria in an ecosystem was severely decreased, which is the most likely result

A researcher claims that the epinephrine signaling pathway controls a catabolic process in muscle cells pinephrine is a signaling molecule that binds to a transmembrane protein.

Make a punnet square showing the alleles the parent plants and the first generation

Which one of the following diseases is caused by a virus? A. Strep throat B. Hepatitis B C. Tetanus D. Tuberculosis

Explain how it would be possible to have a change in a single base of DNA, but have the protein NOT change and be functional.

During DNA replication, what is the first process to occur? a:zipping up of the DNA strand for copying b:synthesis of the leading strand c:synthesis of the lagging strand d:unwinding of the parental DNA by helicase enzyme

When a person is frightened what system is most activated sympathetic or parasympathetic nervous system?