Answer the following statements true (T) or false (F)
1. A single gene always encodes for an enzyme.
2. RNA polymerase II of eukaryotes always requires more than one general transcription factor to initiate transcription.
3. DNA is used as a template to make mRNA, which contains the information to make a polypeptide.
4. As part of the transcriptional unit, regulatory sequences are the sites where RNA polymerase and transcription factors bind to regulate transcription.
1. TRUE
2. TRUE
3. TRUE
4. FALSE
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While analyzing forensic evidence gathered at a crime scene, a lab technician assigned to the case compares DNA collected at the scene to DNA from three suspects. The technician finds that all three suspects have genetic maps that are similar to the DNA collected at the scene, but they all have a number of unique markers that differ from the DNA evidence. What conclusion can be drawn from these facts?
a. The evidence from the crime scene has been contaminated and is no longer admissible in court. b. All three suspects belong to the same family as the person who left their DNA at the crime scene. c. All three suspects probably belong to the same species as the individual who left DNA at the scene. d. None of the suspects were at the crime scene, and they no longer need to be investigated in this case.
Gastric bypass surgery
a. is more effective than standard weight loss methods. b. reduces the size of the patient's stomach and small intestine. c. reduces the amount of ghrelin secreted, so the patient feels less hungry. d. may increase the risk of vitamin and mineral deficiency. e. does all of these
If a cell contains 20 chromosomes, how many chromatids will be present during prophase?
A) 30 B) 20 C) 40 D) 5
The carbon atoms in organic compounds typically form ________ with other atoms.
A. nonpolar covalent bonds B. polar covalent bonds C. ionic bonds D. hydrogen bonds E. either ionic or hydrogen bonds