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Questions in biology

[Answered] Muscles will fatigue very quickly during aerobic exercises, such as jogging, due to lactic acid buildup.

[Answered] Which characteristic of living organisms involves ingestion, absorption, and excretion? A. Growth B. Nutrition C. Respiration

[Answered] Place the following events of muscle contraction in the correct order: 1. Calcium is released in the muscle fiber 2. Muscle fibers contract 3. Electrical signal travels down the motor neuron 4. Electrical signal enters the muscle fiber

[Answered] What tissue type forms most of the dermis? A. Stratified columnar epithelium B. Adipose tissue C. Dense irregular connective tissue D. Stratified squamous epithelium

[Answered] Low levels of which neurotransmitter are commonly linked to depression? A. Serotonin B. Estrogen C. Testosterone D. Growth hormone

[Answered] LEVEL 3 Q1. The enzyme that unwinds the double helix of DNA in preparation for DNA replication is called A. DNA Ligase B. DNA Primase C. DNA Polymerase D. DNA Helicase Q2. The open area of DNA where replication or transcription can take place is called A. Replication bubble B. Replication fork C. Replication strand D. Replication origin Q3. The enzyme involved in DNA replication that joins individual nucleotides to produce a DNA molecule is called A. DNA Ligase B. DNA Primase C. DNA Polymerase D. DNA Helicase Q4. Once the two strands of DNA are separated, what prevents them from assuming their double-helical shape? A. Other proteins hold the strands apart B. They are too far away from each other C. Each strand has opposing charges, which keep them repelled D. All of the above

[Answered] The "-cide" in viricide pertains to which of the following? A. Kill B. Weaken C. Nurture D. Nourish

[Answered] Sperm production begins at puberty and involves which of the following hormones? A. Estrogen B. LH and FSH C. Calcitonin D. Insulin

[Answered] This moth's name refers to the moon, it is nocturnal in habit, and is well known for its beauty. Can you identify the moth?

[Answered] Which of these common pathogens cause diarrhea when they infect a person? Click 'Yes' or 'No' for each one, then click 'Submit'. MRSA Y N Influenza Y N C. difficile Y N Norovirus Y N