Which of the following statements is true regarding mitochondrial and chloroplast genomes?
A) They contain mostly interspersed and tandemly repeated DNA.
B) They are able to replicate independently of the nuclear DNA.
C) They contain all the genes necessary for aerobic respiration.
D) They are degenerate bacterial genomes that don't contain important protein-coding genes.
E) They only encode for ribosomal and transfer RNAs.
Answer: B
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Answer the following questions true (T) or false (F)
1. The first anticodon on a tRNA that binds to an mRNA transcript is complementary to AUG. 2. During translation, one mRNA can be translated by many ribosomes at once. 3. tRNA and rRNA are not translated into proteins.
In plant cells, the middle lamella _____
A) allows adjacent cells to adhere to one another B) prevents dehydration of adjacent cells C) maintains the plant's circulatory system D) allows for gas and nutrient exchange among adjacent cells
Which of the following is not a feature of miRNAs?
A. Primary miRNA transcripts have internal complementary sequences capable of forming hairpin structures. B. Precursor miRNAs have internal complementary sequences capable of forming hairpin structures. C. miRNAs are exported to nuclease in their single-stranded form. D. Precursor miRNAs are approximately 60–70 nucleotides long.
Which statement describes a similarity between the diploid and haploid phases of plant life?
a. both end in fertilization b. both are multicellular c. both are immediately followed by meiosis d. both contain sporophytes e. both contain spores