Ask Question, Ask an Expert


Ask Biology Expert

problem 1) Which of the following statements are true?

All cells

(a) are specialised         (d) contain chloroplasts
(b) have a cell wall        (e) have a cell membrane.
(c) have cytoplasm                                          

problem 2) Match the following functions to cell structures listed below:

(a) controls cell division          (c) controls entry of substances into a cell
(b) produces energy,              (d) encloses a plant cell.

mitochondrion, cell membrane, nucleus, cell wall

problem 3) From the list below choose elements and compounds which you would expect to find in each of (a) proteins, (b) starch, (c) lipids.

nitrogen, glucose, carbon, amino acids, fatty acid, sulphur, oxygen, glycerol, hydrogen (A/R)

problem 4) A suspension of yeast is dropped into some hydrogen peroxide in the test-tube. The hydrogen peroxide fizzes vigorously and gives off oxygen.

(a) What further experiment must be carried out to test hypothesis that the enzyme in the yeast catalyses the breakdown of hydrogen peroxide?

(b) What result will (i) support the hypothesis, (ii) destroy the hypothesis?

(c) Describe your answers to (b). 

problem 5) A student's account of an experiment reads as follows:

I placed some diastase powder (a starch-digesting enzyme) in some starch solution in a test-tube. By taking samples from the tube and testing them with iodine, I found that the starch   gradually disappeared.

I repeated the experiment but added a few cubic centimetres of dilute sodium carbonate (an alkali) to the starch solution before adding the diastase. The starch took longer to disappear. I concluded that diastase had an optimum pH of 7 (neutral).

Criticise (a) the student's experimental design (as judged by the report), (b) the student' s interpretation of the results

problem 6) Which of the following statements best describes the process of respiration?

Respiration in living organisms is:

(a) the intake of oxygen and output of carbon dioxide
(b) the intake of food and the output of energy
(c) the intake of food and the release of carbon dioxide
(d) the breakdown of food to release energy
(e) the oxidation of food to carbon dioxide.                                                                                  

problem 7) Describe what an oxygen debt is and how it is caused.                                                                                        

problem 8) When carbohydrate is oxidised to carbon dioxide and water in the body, 21 kJ energy is produced for every litre of oxygen used. In an experiment, a girl absorbed 2 litres of oxygen in 10 minutes. What is her energy production in kilojoules per hour?

Biology, Academics

  • Category:- Biology
  • Reference No.:- M95242

Have any Question? 

Related Questions in Biology

Some bacteria utilize a protein molecule called

Some bacteria utilize a protein molecule, called bacteriorhodopsin, that uses light-activation to move protons across a membrane to generate a proton gradient that is then used by ATP-synthase to create energy for the ba ...

Microbiology1 for what specific purpose was gram staining

Microbiology 1. For what specific purpose was gram staining developed for? what is it used for today? 2. Why is the presence of air bubbles a sign of contamination? 3. Why is a gram stain helpful when monitoring bacteria ...

Discussion topicheart diseasenbspis the leading cause of

Discussion Topic Heart disease  is the leading cause of death in the United States. Almost 700,000 people die of heart disease in the U.S. each year. Heart disease is a term that includes several more specific heart cond ...

Jerry coyne proposes a question at what point are the

Jerry Coyne proposes a question. At what point are the differences between populations large enough to make us call them different species? please answer question and defend answer.

Explain how the decline in genetic diversity with distance

Explain how the decline in genetic diversity with distance from Africa supports the Out of Africa hypotheses.

For training and development classcompare and contrast two

(For Training and Development Class) Compare and contrast two learning theories. Which one do you believe is most effective? Why? Your response should be at least 200 words in length.

Digestion is an important process in the human bodya

Digestion is an important process in the human body. a) Identify and describe the digestive processes. b) Consider the mouth, stomach, small intestines and large intestines - identify the digestive enzymes that are prese ...

Please refer to the following interactive map as you

Please refer to the following interactive map as you complete this activity:  Here are instructions for how to read the map: ...

How to define which domain of membrane protein is

How to define which domain of membrane protein is intracellular or extracellular domain?

Steroids hormonessuch as testosterone are derived from

Steroids hormones,such as testosterone, are derived from cholesterol. What type of macromolecule are they?

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro