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Questions in biology

[Answered] What is a taxonomic key?

[Answered] Bacteria cannot grow in temperatures below 41 degrees F. A. True B. False

[Answered] What is an example of a starch? Select one: A. Cane sugar B. Fruit C. Milk D. Grains

[Answered] Which of the following is an example of a non-falsifiable hypothesis? A. The XYZ diet works by suppressing appetite. B. The XYZ diet works by using smaller portion sizes. C. The XYZ diet works by eliminating thousands of invisible toxins from the body. D. The XYZ diet works by increasing energy expenditure.

[Answered] What is the function of the peripheral nervous system? A. To transmit signals between the body and the brain or spinal cord B. To transmit signals related to movement of the hands and feet. C. To transport oxygen and nutrients throughout the body D. To transport blood to the brain

[Answered] Which of the following best describes the role of RNA polymerase in a cell? A. It modifies an mRNA transcript by adding a poly-A tail and removing introns. B. It attaches to a DNA strand and unzips the molecule into two separate strands. C. It initiates translation of mRNA at the start codon for protein synthesis. D. It reads the DNA molecule for synthesis of a complementary strand of mRNA.

[Answered] Answer the following questions: 1. Why are xylem cells mostly dead? 2. Are phloem cells alive? 3. Can the phloem transport materials other than sugars? 4. How does water move in the xylem? 5. What happens if the phloem is damaged?

[Answered] Objectives: 1. Describe the direction of the movement of water molecules across a differentially permeable membrane and the condition that brings this about. 2. Observe the effects of osmosis in living cells. Materials: - 2 pcs transparent glass/plastic cup - 4 strips of raw potato (peeled and cut into the same length and width) - 2 teaspoons salt - Water - Ruler marker Procedure: 1. Measure the dimensions of the potato strips. Record these data in the table below. 2. Fill the cups with water (height just enough to cover the potato strip). Label the first cup as A and the second cup as B. Place 2 teaspoons of salt into container B. Stir the contents in container B until salt is fully dissolved. Mark the location of the top water level in each container. 3. Soak the potato strips for 30 to 45 minutes in the container, two in each container. 4. Take the strips out of the container and measure the dimensions of the soaked strips. Also observe the level of water in each container. Are there changes? Record this data on the table below. | Container | Solution | Sample | BEFORE SOAKING | AFTER SOAKING | | | |-----------|---------------|--------|----------------|---------------|------|------| | | | | Length | Width | Length | Width | | A | Pure/Tap water| 1 | | | | | | | | 2 | | | | | | B | Salt solution | 1 | | | | | | | | 2 | | | | | Questions to Answer: 1. What happens to the potato strips in container A after soaking? 2. What happens to the potato strips in container B after soaking? 3. What may have caused these to happen to potato strip in A? in B?

[Answered] Question 62 Linear DNA in the human genome is packaged at several levels. Which of the following represents the levels from least packaged to most packaged? (A) Nucleosomes, DNA strand, chromosomes (B) DNA strand, nucleosomes, chromosomes (C) DNA strand, chromosomes, nucleosomes (D) Chromosomes, nucleosomes, DNA strand

[Answered] The stage of prenatal development that lasts from week three through eight is the: A) blastocyst. B) embryonic. C) fetal. D) germinal.