If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are:
A: not true-breeding.
B: called the F1 generation.
C: called hybrids.
D: heterozygous for that character.
E: all of the above.
Answer: E: all of the above.
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Which of the following is useful in distinguishing between prokaryotic and eukaryotic cells?
A. The presence of membrane-delimited organelles within the cytoplasm B. The use of DNA for the storage of genetic information C. The presence of ribosomes for the synthesis of proteins D. All of the choices are correct.
The organism that causes the sexually transmitted disease trichomoniasis is a _____
a. flagellated protozoan c. ciliate b. radiolarian d. apicomplexan
The cutaneous membrane is also known as
a. the stomach lining. b. the skin. c. the brain. d. the heart lining. e. the lung lining.
Most microorganisms on Earth can only live and survive in habitats that are similar to human body conditions.
Answer the following statement true (T) or false (F)