Mendel performed a testcross with his plants and all the resulting progeny had the same colour. What information did this testcross provide?
a. The parent with the dominant trait is heterozygous.
b. The parent with the dominant trait is homozygous.
c. The parent with the recessive trait is heterozygous.
d. The parent with the recessive trait is homozygous.
Ans: b. The parent with the dominant trait is homozygous.
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Cyanobacteria are prokaryotes that carry out oxygenic photosynthesis like green plants; this means that
A. they produce oxygen as a by-product of photosynthesis. B. they have two distinct photosystems. C. they use water as their electron source. D. All of the choices are correct.
Dr. Ratard was trying to determine the cause of a mysterious epidemic affecting fish in the gulf of New Mexico. His proposal that the deaths were caused by an organism called a protist is considered a(n) _________
A. theory. B. data set. C. hypothesis. D. conclusion. E. experiment.
Renin is released by ________ cells of the ________.
A) principal : afferent arteriole B) granular : afferent arteriole C) granular : distal tubule D) principal : distal tubule E) intercalated : afferent arteriole
The "X" shaped chromosomal hereditary material can be packaged in this organelle in eukaryotic cells but not in prokaryotic cells. This organelle is the:
A. nucleoid. B. chloroplast. C. ribosomes. D. nucleus. E. mitochondria.