In eukaryotic cells, which of the following contains DNA?
A. Nucleus, mitochondria, Golgi apparatus
B. Nucleus, endoplasmic reticulum, Golgi apparatus
C. Nucleus, nucleolus, Golgi apparatus
D. Nucleus, chloroplast, mitochondria
E. Nucleus, chloroplast, peroxisome
Answer: D. Nucleus, chloroplast, mitochondria
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Individuals with xeroderma pigmentosum inherit a faulty DNA repair mechanism. As a consequence,
they
a. are sterile. b. have no proofreading during DNA replication. c. cannot join the Okazaki fragments produced during DNA replication. d. easily develop skin cancer when exposed to sunlight. e. lose part of the DNA on the ends of chromosomes during each round of DNA replication.
A scientist who claims to have discovered a new plant hormone must demonstrate that this compound is
A) made from cell proteins. B) produced in large amounts. C) capable of stimulating differentiated cells to form meristem tissue. D) formed in one part of the plant but has an effect in a different part. E) needed by the plant as a major source of energy.
The pH indicator(s) in the Triple Sugar Iron Agar is (are)
A. The correct answer is not listed B. Neutral red C. Phenol red D. Methyl red
Which of the following is NOT correct?
Select one: a. xylem—conducts water up from the soil b. phloem—transports organic nutrients c. vascular tissue—consists of xylem and phloem d. vascular plants—sporophyte is dominant e. sporophyte—haploid