Genes can be transferred between prokaryotic cells when they exchange ________ .
A) ribosomes.
B) mitochondrial DNA.
C) nuclei.
D) plasmids.
E) cytoplasms
Answer: D) plasmids.
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A tracheid is:
A. a gametophyte cell B. a small branch of an insect trachea C. a seed-bearing stem D. a specialized vascular cell E. a reproductive chamber
An individual with the genotype AaBbCC will produce gametes with which possible assortment of genes?
A) A,B,a,b, or C B) Aa, Bb, or Cc C) ABC, AbC, aBC, or abC D) AaBbCC
Which of the following is a characteristic of all chordates?
A) They all have vertebral columns. B) They all exhibit radial symmetry. C) They all have a notochord sometime during their life cycle. D) They all have an exoskeleton sometime during their life cycle.
Wetlands ________
A) are important in improving water quality B) include rivers, streams, ponds, and lakes C) are bodies of swiftly flowing water D) are found in the intertidal zone