Which of the following was the last to appear in the fossil record?
A. pines and other gymnosperms
B. all major groups of plants we see today
C. mosses and other bryophytes
D. ferns and other seedless vascular plants
E. angiosperms (flowering plants)
E. angiosperms (flowering plants)
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Thioglycolate medium contains the following: yeast extract, pancreatic digest of casein, glucose, L-cysteine, sodium chloride, sodium thioglycolate, and agar. It is considered a complex medium because
A. depending on their oxygen utilization pattern, organisms will grow differently on it. B. thioglycolate has a carbon-sulfur bond that many microbes cannot break enzymatically. C. it has multiple ingredients for a broad range of nutrients. D. both yeast extract and pancreatic digest of casein are not chemically defined.
Purple flower (A) is dominant over white flower (a), and tall stem (B) is dominant over short stem (b). The Punnett square
represents a cross between two dihybrids (AaBb ? AaBb). In the figure above, how many plants would have purple flowers and tall stems?
a. 1 b. 3 c. 5 d. 9 e. 16
While Deinococci can be isolated from sources such as meat and feces, their true natural habitat remains unknown.
Answer the following statement true (T) or false (F)
The calcium that triggers muscle contraction is stored in the
A) motor neuron. B) plasma membrane of cells. C) endoplasmic reticulum. D) mitochondria.