Which term refers to the selectively permeable barrier that is present in the innermost layer of the root cortex?

a. pericycle
b. root hairs
c. endodermis
d. quiescent centre


Ans: c. endodermis

Biology & Microbiology

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In humans, the 30S pre-RNA transcript yields three rRNA segments following transcription and RNA cleavage. What RNA transcripts are generated by the 30S pre-RNA transcript in E. coli?

A) two rRNAs (15S each) B) three rRNAs (5S, 16S, and 23S) C) two tRNA transcripts D) three rRNAs (5.8S, 18S, and 28S) and two tRNA transcripts E) three rRNAs (5S, 16S, and 23S) and two tRNA transcripts

Biology & Microbiology

During photosynthesis in a leaf, sugars are loaded into the sieve tube by _____ followed by ______ to increase the pressure.

A. osmosis, facilitated diffusion B. facilitated diffusion, osmosis C. gravity, active transport D. active transport, osmosis E. osmosis, gravity

Biology & Microbiology

The fossil "hobbits" discovered in Indonesia may be a ________ that lived ________

A) newly discovered species of Homo; as recently as 18,000 years ago B) population of Homo sapiens with a genetic disorder; at the same time as the Neanderthals C) lineage of early hominins; about 5 million years ago D) dwarf lineage of Australopithecus; around the same time as "Lucy"

Biology & Microbiology

Which bacteria is most likely to colonize a satin finished metal surface commonly used for biomedical procedures?

a) Staphylococcus aureus b) Staphylococcus epidermidis c) Streptococcus mutans d) Staphylococcus saprophyticus

Biology & Microbiology