In the flower diagram shown above, the item labeled "5" is the
a. receptacle.
b. ovule.
c. style.
d. stigma.
e. anther.
D
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Ligaments connect
(a) bones to bones. (b) skeletal muscles to bones. (c) tendons to bones. (d) skeletal muscles to tendons.
Elongated photosynthetic cells attached to the upper epidermis in leaves are called ________
a. pericycle b. epidermal cells c. palisade mesophyll d. spongy mesophyll
Plasmodesmata can change in number, and when dilated can provide a passageway for _____
A) macromolecules such as ribonucleic acid (RNA) and proteins B) ribosomes C) chloroplasts D) mitochondria
Why were the first RNA replication experiments insufficient support for the RNA world hypothesis?
a. The experiments did not demonstrate natural selection. b. RNA could not adapt to environmental challenges. c. The RNA produced was not self-replicating. d. No mutations occurred in the RNA. e. Mutations occurred but they were not heritable.