A reddish chemical, lipofuscin, is found in greater quantities in cells of older people than in those from younger people. This chemical should be broken down in the cells. Which specific type of organelle is not working as well in the seniors?
A) lysosome B) rough endoplasmic reticulum
C) mitochondrion D) nucleus
Answer: A
Biology & Microbiology
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Which of the following structures constitute the stamen of a flower? Select all correct choices
A. stigma B. anther C. ovary D. style E. filament
Biology & Microbiology
pH is a measure of the number of _____ in a fluid
1.covalent bonds 2.hydrogen ions 3.calcium ions 4.water molecules
Biology & Microbiology
Which technique reduces the amount of a specific RNA or protein produced by an organism?
a. knockout b. chain termination c. knockdown d. transgenesis e. knock-in
Biology & Microbiology
Rhizoids differ from roots in that rhizoids __________.
a. do not function in anchoring organisms b. are only possessed by seed plants c. are not vascular d. are not multicellular structures e. All of the listed responses are correct.
Biology & Microbiology