In a bacterium, we will find DNA in _____
A) a membrane-enclosed nucleus
B) mitochondria
C) the endoplasmic reticulum
D) the nucleoid
E) ribosomes
Answer: D
Answer: D
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"Typhoid Mary" is an example of a ________, because she was infected by the causative agent for typhoid fever yet was asymptomatic
A) fomite B) carrier C) vector D) vehicle
Which of the following statements is TRUE of restriction enzymes?
A. They are not naturally produced by bacteria, but are bioengineered by them. B. They protect bacterial cells from invasion by foreign DNA. C. There are less than 10 restriction enzymes known. D. They cleave the DNA backbone at only one location. E. They cleave DNA only at sites of adjacent thymine bases.
What event initiates development?
A. fertilization B. cleavage C. gastrulation D. organogenesis
During extended periods of dehydration, tardigrades ____
a. enter suspended animation b. migrate to the soil subsurface c. enter small ponds and lakes d. climb inside a plant leaf and form cysts
e. replace the water in their cells with salt