Bacteria protect themselves from bacteriophage infections by producing restriction enzymes that cut

up foreign RNA of the phage.
____________________ Indicate whether the statement is true or false.


F, DNA

Biology & Microbiology

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Teratogens affect the ____ more than any other part of the fetal body

a. central nervous system b. upper limbs c. heart d. lower limbs e. external genitalia

Biology & Microbiology

Which of the following structures are NOT used by chemical synapses during signal transmission?

a. gap junctions b. ligand-gated receptors c. Ca2+ d. vesicles e. neurotransmitters

Biology & Microbiology

What completes preparation of uterus for pregnancy?  

A.  FSH B.  LH C.  Testosterone D.  Progesterone E.  Prolactin

Biology & Microbiology

Additional observations were made on day 21, and no yellow-leaved seedlings were found alive in either dish. This is most likely because

(A) yellow-leaved seedlings were unable to absorb water from the paper towels (B) taller green-leaved seedlings blocked the light and prevented photosynthesis (C) yellow-leaved seedlings were unable to convert light energy to chemical energy (D) a higher rate of respiration in yellow-leaved seedlings depleted their stored nutrients

Biology & Microbiology