Which tissue is composed of spindle-shaped contractile cells that are commonly found in the walls of tubular organs such as blood vessels?
a. squamous epithelium
b. smooth muscle
c. skeletal muscle
d. cardiac muscle
e. adipose tissue
B
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Place these genes in their temporal order of expression from earliest to latest during Drosophila development.
A. Bicoid, Gap, Homeotic B. Homeotic, Gap, Bicoid C. Homeotic, Bicoid,Gap D. These genes are not expressed at different times during development. They are expressed at the same time, but in a different spatial order. E. Kruppel, gooseberry, even-skipped
Stabilizing selection occurs when
a. the environment controls which organisms will survive. b. humans determine which organisms will survive. c. the extremes of the population have a lesser chance to survive. d. the extremes of the population have a better chance to survive. e. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
The ________ is a modified form of endoplasmic reticulum that stores and releases calcium ions when a muscle contracts
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The photoreceptors that allow for an individual's black-and-white vision are known as ________
Fill in the blank(s) with correct word