Hdwk - Study guides, Class notes & Summaries

In the Background section, it is noted that inhibition of protein synthesis blocks cell division in sea urchins. This observation implies that: - new proteins must be made for cell division to occur. Why did the researchers choose sea urchin embryos to study cell division? - Sea urchin embryo cells divide rapidly by mitosis. In the gel, the amount of protein can be determined by: - the intensity of the band. In the gel, proteins migrate different distances based on: - their size and charge....

HDWK Activity Chapter 35 Fig. 35.10 Questions and Answers | Latest Update | Graded A+ **Question 1: What variables were plotted on the graph showing percent force versus percent muscle length?** - **(a)** The dependent variable was the percentage of force exerted by the muscle. - **(b)** The independent variable was the percentage of muscle length. - **(c)** The dependent variable was the force exerted by the muscle. - **(d)** The independent variable was the length of the muscle. ...

HDWK Chapter 4 Questions and Answers | Latest Version | Graded A+ **What does the production of three different polypeptides (polyserine, polyhistidine, and polyisoleucine) from an mRNA with repeating UCA synthesized by Khorana's group indicate?** **This result indicates that the genetic code is a triplet code.** **When Khorana's group synthesized an mRNA with repeating AGU, only polyserine (Ser) and polyvaline (Val) were produced. According to the codon table, why were only two po...

BIOS1610 - Chapter 10 HDWK Questions and Answers | Latest Update | 100% Pass **Why does the Background section mention Bissell's research on mammary cells?** **It provides context from a related experiment that influenced Caron's own question and hypothesis.** **What hypothesis did Caron propose for her experiment?** **Caron hypothesized that a protein present in the extracellular matrix is necessary for hepatocytes to secrete albumin.** **What is the null hypothesis for C...

HDWK Activity Chapter 9 Fig. 9.6 | Latest Version | 2024/2025 | Graded A+ **Why did Kohler and Lipton begin by replicating a previous experiment?** **To confirm the reliability and reproducibility of the initial findings.** **In a subsequent experiment, researchers divided platelet proteins from rat blood into six fractions (A, B, C, D, E, F) and accidentally combined some fractions during application to rat fibroblasts. What did they observe regarding cell growth rates?** **The...

HDWK Activity Chapter 8 Fig. 8.3 Questions and Answers | Latest Update | Graded A+ **What were the alternative hypotheses the experiment was designed to test?** **Hypotheses 1: Water (H2O) is the source of the O2 released in photosynthesis.** **Hypothesis 2: Carbon dioxide (CO2) is the source of the O2 released in photosynthesis.** **Hypothesis 3: Both H2O and CO2 release O2 in photosynthesis.** **Hypothesis 4: O2 released during photosynthesis is derived from something other than...

Bio- Chapter 16 HDWK Activity Fig. 16.11 | Latest Version | Graded A+ **What is the null hypothesis(es), which is the hypothesis to be rejected, for these experiments?** **Recombination is not due to crossing over between genes, and the distance between genes does not affect recombination frequency.** **According to the genetic map, what is the recombination frequency between the genes w and ec?** **The frequency is 4.0 percent.** **Based on the genetic map, what is the reco...

HDWK Chapter 7 Questions and Answers | Latest Update | Graded A+ **What was Racker and Stoeckenius's experiment hypothesis?** **Their hypothesis was that a proton gradient is necessary for ATP synthase to produce ATP.** **What does the term "dependent variable" refer to in their experiment?** **It refers to the concentration of protons outside the vesicles, measured by pH.** **What is the independent variable in their experiment?** **The independent variable is the presenc...

HDWK Activity CH12 Questions and Answers Latest Update | 2024/2025 | Rated A+ **Which element besides nitrogen could have been utilized to label DNA in this experiment?** **Sulfur (S) could have been used to tag DNA.** **In the Meselson-Stahl experiment, was the DNA circular or linear in shape?** **The DNA was circular in shape.** **What do the bands in the test tubes represent?** **The bands represent double-stranded DNA molecules.** **If bacteria were grown for many ge...