Which cross-section of a tree demonstrates

significant system acquired resistance?
a. A
b. B
c. C
d. None of these
e. All of these


Answer: a

Biology & Microbiology

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If a diploid organism has a genome consisting of 4 chromosomes, it can produce ____ different combinations of chromosomes (disregarding crossing over)

a. 4 b. 8 c. 12 d. 16 e. 64

Biology & Microbiology

Answer the following statements true (T) or false (F)

1.Mollusks that have two-part hinged shells are called bivalves. 2.Arthropods have jointed legs. 3.Presence of vertebrae is a shared characteristic among all chordates. 4.An internal membrane in chordates that protects the developing fetus is the notochord. 5.Birds are endothermic, feathered reptiles.

Biology & Microbiology

As a result of receptor up-regulation:a

the number of genes that code for a receptor increases. b. the sensitivity of a cell to a hormone decreases. c. the number of receptors decreases. d. the concentration of hormone molecules in the blood increases. e. a hormone's signal is amplified

Biology & Microbiology

Assuming a normal number of autosomes, what would be the sex of the following: XXY mouse, XXY Drosophila?

What will be an ideal response?

Biology & Microbiology