Which of the following organelles are enclosed by a double membrane?
a. All organelles are enclosed by a double membrane.
b. vacuoles and the endoplasmic reticulum
c. the nucleus and the Golgi apparatus
d. mitochondria and chloroplasts
e. ribosomes and lysosomes
Ans: d. mitochondria and chloroplasts
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Which of the following regarding the Spemann organizer is true? (Check all that apply.)
_____ Signaling molecules from the organizer inhibit ventral development. _____ The dorsal lip cells directly activate dorsal development. _____ The organizer determines the dorsal-ventral axis. _____ The organizer forms in the area of the grey crescent. _____ The point of sperm entry determines the orientation of the organizer.
A deficiency of which B vitamin in pregnant woman can cause birth defects?
a. riboflavinriboflavin b. biotin c. folic acid d. niacin e. thiamin
A mutation in RTK receptor that allows the receptor to bind the ligand and pair with a wild-type receptor but blocks signal transduction is classified as a ________ mutation,
whereas a mutation that activates RTK pairing signal transduction even in the absence of ligand is classified as a ________ mutation. Fill in the blank with correct word.
Which of the following represents what Darwin thought of natural selection?
a. He reasoned that if characteristics that better enable organisms to adapt to specific environmental pressures exist, then selective breeding could do the same. b. He reasoned that if a person could select different characteristics when breeding organisms, then nature could do so as well. c. Humans were selecting the characteristics they wanted in the offspring by choosing parents with those traits. d. Humans were selecting the characteristics they wanted in the offspring by eliminating indiv