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
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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
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
What completes preparation of uterus for pregnancy?
A. FSH B. LH C. Testosterone D. Progesterone E. Prolactin
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